Astronomical Data - Very useful for knowing when magic hour falls, no matter where you are. From the US Naval Observatory.
WaterWatch - Real-time streamflow information for rivers and streams in the US. I use it to learn when waterfalls should be flowing heavily!
Ken Rockwell - Excellent information on all aspects of photography.
Bruce Percy - The Light and the Land - Incredibly talented, surreal Scottish landscape photographer.
TimeCatcher - Often spectacular landscape photos
Adorama - Fast and reliable camera store and printmaker. They sell virtually everything related to photography.
Flickr - My photostream, where you'll find far more photos than on this site.
Facebook - My photos. I've been working on this for years. It's mostly for sharing good times, but there are a few gems too.
GameFAQs - My favorite game help resource for many years.
Theta Chi Omega at Penn State - My fraternity chapter.
Behind the Name - Etymology and history of first names.
Schmap!! - Touring maps with lots of extra info.
midatlantichikes.com - Hiking information and maps for PA, MD, VA, and WV.
Hiking Upward - A great resource for hikes focused almost exclusively on WV and VA.
Travellerspoint - A great repository of travel information and photos.
The Michael O'Brian Band - Only the world's greatest Irish pub song duo!
The Irish in Film - Peerless information on the Irish in cinema.
Irish Dictionary - Nice for quick Irish translations, especially for those odd words written on pub fronts like craic.
Gælċló - A wonderful resource of free Irish fonts. The site is in Irish, but can be readily translated using Google.
DC Area Links
dcist - A good resource for DC area happenings, presented often in quite a witty manner.